ammoniumn.

/əˈməʊnɪəm/

Etymology: < modern Latin ammōnium, formed by Berzelius, 1808, on ammonia n., after analogy of soda, sodium, magnesia, magnesium, and the names of the recent metals generally.

Chem.

The radical supposed to exist in the salts of ammonia, a compound of 4 equivalents of hydrogen with 1 of nitrogen, NH₄, which behaves in composition as a monatomic alkaline metal, replacing, and presenting close analogies to, sodium and potassium.

ΘΚΠ

the world > matter > chemistry > organic chemistry > amines > [noun] > (compounds) H atoms replaced by amines or amides > radical supposed to exist in the salts of

ammonium1808

1808 Sir H. Davy in Philos. Trans. (Royal Soc.) 98 364 From platina to potassium there is a regular order of gradation as to physical and chemical properties, and this would probably extend to ammonium, could it be obtained in the fixed form.

1850 C. G. B. Daubeny Atom. Theory ix. 295 The atomic volume which these lighter metals, viz. ammonium, barium, calcium..have.

1875 A. Ure Dict. Arts I. 142 Although it may be objected..that the metal ammonium is not known, yet a curious metallic compound of this metal with mercury has been obtained.

Compounds

C1. attrib. In names of compounds in which ammonia was formerly, and is still often, used, as ammonium salts, ammonium carbonate, ammonium chloride, ammonium phosphate.

ΚΠ

1863 H. Watts Dict. Chem. (1872) I. 188 Ammonium-salts are isomorphous with potassium salts.

1863 H. Watts Dict. Chem. (1872) I. 195 Spoken of as ammonium-bases in contradistinction to the amine- or ammonia-bases.

1866 H. E. Roscoe Lessons Elem. Chem. xix. 174 Ammonium-chloride, or sal-ammoniac.

C2.

Categories »

ammonium alum n. (see alum n.¹ 2).

ammonium amalgam n. a soft solid metallic substance, an amalgam of ammonium and mercury, analogous to the sodium and potassium amalgams.

ΚΠ

1873 A. W. Williamson Chem. for Students viii. §52 The ammonium amalgam very rapidly decomposes when removed from the liquid.

This entry has not yet been fully updated (first published 1884; most recently modified version published online March 2012).

单词	ammonium
释义	ammoniumn. /əˈməʊnɪəm/ Etymology: < modern Latin ammōnium, formed by Berzelius, 1808, on ammonia n., after analogy of soda, sodium, magnesia, magnesium, and the names of the recent metals generally. Chem. The radical supposed to exist in the salts of ammonia, a compound of 4 equivalents of hydrogen with 1 of nitrogen, NH₄, which behaves in composition as a monatomic alkaline metal, replacing, and presenting close analogies to, sodium and potassium. ΘΚΠ the world > matter > chemistry > organic chemistry > amines > [noun] > (compounds) H atoms replaced by amines or amides > radical supposed to exist in the salts of ammonium1808 1808 Sir H. Davy in Philos. Trans. (Royal Soc.) 98 364 From platina to potassium there is a regular order of gradation as to physical and chemical properties, and this would probably extend to ammonium, could it be obtained in the fixed form. 1850 C. G. B. Daubeny Atom. Theory ix. 295 The atomic volume which these lighter metals, viz. ammonium, barium, calcium..have. 1875 A. Ure Dict. Arts I. 142 Although it may be objected..that the metal ammonium is not known, yet a curious metallic compound of this metal with mercury has been obtained. Compounds C1. attrib. In names of compounds in which ammonia was formerly, and is still often, used, as ammonium salts, ammonium carbonate, ammonium chloride, ammonium phosphate. ΚΠ 1863 H. Watts Dict. Chem. (1872) I. 188 Ammonium-salts are isomorphous with potassium salts. 1863 H. Watts Dict. Chem. (1872) I. 195 Spoken of as ammonium-bases in contradistinction to the amine- or ammonia-bases. 1866 H. E. Roscoe Lessons Elem. Chem. xix. 174 Ammonium-chloride, or sal-ammoniac. C2. Categories » ammonium alum n. (see alum n.¹ 2). ammonium amalgam n. a soft solid metallic substance, an amalgam of ammonium and mercury, analogous to the sodium and potassium amalgams. ΚΠ 1873 A. W. Williamson Chem. for Students viii. §52 The ammonium amalgam very rapidly decomposes when removed from the liquid. This entry has not yet been fully updated (first published 1884; most recently modified version published online March 2012). < n.1808
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